JP2013114057A - Fixing device - Google Patents

Fixing device Download PDF

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Publication number
JP2013114057A
JP2013114057A JP2011260508A JP2011260508A JP2013114057A JP 2013114057 A JP2013114057 A JP 2013114057A JP 2011260508 A JP2011260508 A JP 2011260508A JP 2011260508 A JP2011260508 A JP 2011260508A JP 2013114057 A JP2013114057 A JP 2013114057A
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Japan
Prior art keywords
nip
bent portion
nip plate
plate
fixing device
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Granted
Application number
JP2011260508A
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Japanese (ja)
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JP5935305B2 (en
Inventor
Noboru Suzuki
鈴木  登
Kei Ishida
圭 石田
Takushi Matsuno
卓士 松野
Kaoru Suzuki
薫 鈴木
Kotaro Haruta
晃太郎 春田
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Brother Ind Ltd
ブラザー工業株式会社
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Application filed by Brother Ind Ltd, ブラザー工業株式会社 filed Critical Brother Ind Ltd
Priority to JP2011260508A priority Critical patent/JP5935305B2/en
Priority claimed from US13/625,043 external-priority patent/US8938193B2/en
Publication of JP2013114057A publication Critical patent/JP2013114057A/en
Application granted granted Critical
Publication of JP5935305B2 publication Critical patent/JP5935305B2/en
Application status is Active legal-status Critical
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Abstract

An object of the present invention is to provide a fixing device capable of efficiently heating a nip plate.
A fixing device 100 includes a flexible cylindrical member (fixing belt 110), a heating element disposed inside the cylindrical member, and a heating element disposed inside the cylindrical member. The cylindrical member is sandwiched between the nip plate 130 that receives radiant heat, the U-shaped stay 160 that supports the nip plate 130 in a state of surrounding the heating element, and the nip plate 130. A backup member (pressure roller 140) for forming the nip portion N is provided therebetween. A bent portion 132 that bends toward the upstream side wall (front wall 162) on the upstream side of the stay 160 is formed on the upstream side in the conveyance direction of the nip plate 130, and an upper end edge 132 </ b> A of the bent portion 132 is formed at the upper end edge 132 </ b> A. Is supported by the upstream side wall.
[Selection] Figure 4

Description

  The present invention provides a tubular member having flexibility, a nip plate that is in sliding contact with an inner peripheral surface of the tubular member, and a nip portion between the tubular member by sandwiching the tubular member between the nip member. The present invention relates to a fixing device provided with a backup member that forms the same.

  2. Description of the Related Art Conventionally, as a fixing device including a cylindrical member, a nip plate, and a backup member, a fixing device including a U-shaped stay in a sectional view for supporting the nip plate from the side opposite to the backup member is known (see Patent Document 1). . Specifically, in this technique, the both ends of the stay on the nip plate side are configured to support the surface of the nip plate.

JP 2011-95534 A

  However, in the prior art, since the surface of the nip plate is supported by the both end surfaces of the stay, the amount of heat transferred from the nip plate to the stay increases (specifically, the reflection plate and the nip plate sandwiched between the nip plate and the stay). There is a problem in that the nip plate cannot be efficiently heated.

  SUMMARY An advantage of some aspects of the invention is that it provides a fixing device capable of efficiently heating a nip plate.

In order to solve the above problems, the present invention provides a fixing device for thermally fixing a developer image on a recording sheet while moving the recording sheet in a predetermined direction, and a flexible cylindrical member; A heating element arranged inside the cylindrical member, a nip plate arranged inside the cylindrical member and receiving radiant heat from the heating element, and supporting the nip plate in a state of surrounding the heating element. A U-shaped stay in cross-section, and a backup member that forms a nip portion between the tubular member by sandwiching the tubular member between the nip plate and the nip plate.
A bent portion that bends toward the upstream side wall of the stay on the upstream side in the predetermined direction of the recording sheet of the nip plate is formed, and an edge of the bent portion is the edge of the stay. Supported by the upstream side wall.

  According to this configuration, the heat transfer area between the nip plate and the stay (or a member disposed between the nip plate and the stay) can be reduced as compared with the case where the surface of the nip plate is supported by the stay. Therefore, the amount of heat transferred from the nip plate to the stay can be reduced, and the nip plate can be efficiently heated.

  In the above-described configuration, it is preferable that the bent portion is opposed to the heating element.

  According to this, since the bent portion is heated by the heating element, the recording sheet before entering the nip portion can be heated (preheated) in advance by the bent portion, and the heat fixability can be improved.

  Further, in the above-described configuration, the bent portion is provided with a first bent portion formed with a predetermined first curvature radius and on the upstream side of the first bent portion, and a first smaller radius than the first curvature radius. It is desirable to have the 2nd bending part formed with two curvature radii.

  According to this, since the edge of the bent portion can be positioned on the downstream side with a small second curvature radius, compared to the case where the bent portion is formed with one kind of large radius of curvature, the fixing device can be downsized. be able to.

  In the above-described configuration, it is desirable that a lubricant be provided between the second bent portion and the cylindrical member.

  According to this, since the radius of curvature of the second bent part is small, the angle of the corner formed between the second bent part and the tubular member can be increased, and the corner can be enlarged. The large corners can hold the lubricant well.

  In the above-described configuration, a flange extending upstream is formed at the end of the upstream side wall of the stay, and an end edge of the bent portion of the nip plate is supported by the surface of the flange. desirable.

  According to this, even if the position of the edge of the bent portion of the nip plate is slightly shifted in a predetermined direction due to an error, the edge can be reliably supported by the surface of the flange.

  Further, in the above-described configuration, a U-shaped reflecting plate in a sectional view is disposed inside the cylindrical member so as to surround the heating element, and reflects radiant heat from the heating element toward the nip plate, A flange extending outward along the predetermined direction is formed at each edge on the nip plate side of the reflecting plate, and the flange of the reflecting plate may be sandwiched between the stay and the nip plate. Good.

  Even in this case, regarding the portion where the edge of the nip plate is in contact with the reflecting plate, the amount of heat transferred from the nip plate to the reflecting plate is small, so the amount of heat transferred from the nip plate to the stay via the reflecting plate is also small. can do.

  In the configuration described above, an upstream guide is provided on the upstream side of the nip portion in the rotation direction of the cylindrical member, and guides the cylindrical member toward the nip portion, and the upstream guide includes the reflecting plate. It is desirable that the flange protrudes toward the nip plate from the flange.

  According to this, it is possible to suppress the tubular member from being caught by the flange of the reflecting plate by the upstream guide.

  In the above-described configuration, the nip plate includes an extension extending downstream from the nip along the predetermined direction, and the surface of the extension is a downstream side wall on the downstream side of the stay in the predetermined direction. It is desirable to be supported.

  According to this, by extending the extension part from the nip part along a predetermined direction, a nip width can be ensured larger than the structure in which the downstream part of the nip plate is bent near the nip part. Further, in order to ensure a large nip width, a bent portion that is bent toward the stay with a large radius of curvature is provided after the nip plate is extended downstream in the predetermined direction from the nip portion, and the edge of the bent portion is provided. Compared to the structure in which the stay is supported, the position at which the nip plate is supported by the stay can be closer to the nip portion, so that the fixing device can be prevented from being enlarged in the predetermined direction.

  According to the present invention, the nip plate can be efficiently heated.

1 is a cross-sectional view illustrating a laser printer including a fixing device according to an embodiment of the present invention. FIG. 3 is a cross-sectional view illustrating a fixing device. It is a perspective view which shows a nip board. It is a figure for demonstrating in detail the relationship between a nip plate and a stay.

  Next, embodiments of the present invention will be described in detail with reference to the drawings as appropriate. In the following description, first, a schematic configuration of the laser printer 1 (image forming apparatus) including the fixing device 100 according to the embodiment of the present invention will be briefly described, and then a detailed configuration of the fixing device 100 will be described. .

  In the following description, the direction will be described with reference to the user who uses the laser printer 1. That is, the left side in FIG. 1 is “front”, the right side is “rear”, the back side is “left”, and the front side is “right”. Also, the vertical direction in FIG.

<Schematic configuration of laser printer>
As shown in FIG. 1, a laser printer 1 includes a main body housing 2 that feeds a sheet S as an example of a recording sheet, an exposure device 4, and a toner image (developer) on the sheet S. And a fixing device 100 that heat-fixes the toner image on the sheet S while moving the sheet S rearward (predetermined direction).

  The paper feed unit 3 is provided at a lower portion in the main body housing 2 and mainly includes a paper feed tray 31, a paper pressing plate 32, and a paper feed mechanism 33. The paper S stored in the paper feed tray 31 is moved upward by the paper pressing plate 32 and supplied toward the process cartridge 5 (between the photosensitive drum 61 and the transfer roller 63) by the paper feed mechanism 33.

  The exposure apparatus 4 is disposed in the upper part of the main body housing 2 and includes a laser light emitting unit (not shown), a polygon mirror, a lens, a reflecting mirror, and the like that are not shown. In this exposure device 4, the surface of the photosensitive drum 61 is exposed by scanning the surface of the photosensitive drum 61 at high speed with laser light (see the chain line) based on the image data emitted from the laser light emitting unit.

  The process cartridge 5 is disposed below the exposure apparatus 4 and is detachably mounted on the main body housing 2 through an opening formed when the front cover 21 provided on the main body housing 2 is opened. Yes. The process cartridge 5 includes a drum unit 6 and a developing unit 7.

  The drum unit 6 mainly includes a photosensitive drum 61, a charger 62, and a transfer roller 63. The developing unit 7 is detachably attached to the drum unit 6 and contains a developing roller 71, a supply roller 72, a layer thickness regulating blade 73, and toner as an example of a developer. The toner container 74 is mainly provided.

  In the process cartridge 5, the surface of the photosensitive drum 61 is uniformly charged by the charger 62 and then exposed by high-speed scanning of the laser light from the exposure device 4, whereby an image is formed on the photosensitive drum 61. An electrostatic latent image based on the data is formed. Further, the toner in the toner container 74 is supplied to the developing roller 71 via the supply roller 72 and enters between the developing roller 71 and the layer thickness regulating blade 73 to form a thin layer of a certain thickness on the developing roller 71. It is carried on.

  The toner carried on the developing roller 71 is supplied from the developing roller 71 to the electrostatic latent image formed on the photosensitive drum 61. As a result, the electrostatic latent image is visualized and a toner image is formed on the photosensitive drum 61. Thereafter, the sheet S is conveyed between the photosensitive drum 61 and the transfer roller 63 so that the toner image on the photosensitive drum 61 is transferred onto the sheet S.

  The fixing device 100 is provided behind the process cartridge 5. The toner image transferred onto the sheet S is thermally fixed onto the sheet S by passing through the fixing device 100. Thereafter, the paper S is discharged onto the paper discharge tray 22 by the transport rollers 23 and 24.

<Detailed configuration of fixing device>
As shown in FIG. 2, the fixing device 100 includes a fixing belt 110 as an example of a cylindrical member, a halogen lamp 120 as an example of a heating element, a nip plate 130, and a pressure roller 140 as an example of a backup member. The reflector 150, the stay 160, and the cover member 200 are mainly provided.

  The fixing belt 110 is an endless (cylindrical) stainless steel belt having heat resistance and flexibility, and guide portions (upstream guide 310, downstream guide 320, and upper guide 330) formed on the cover member 200. The rotation is guided by.

  The halogen lamp 120 is a member that emits radiant heat and heats the toner on the sheet S by heating the nip plate 130 and the fixing belt 110 (nip portion N). The fixing belt 110 and the nip plate are disposed inside the fixing belt 110. A predetermined interval is arranged from the inner surface of 130.

  The nip plate 130 is a plate-like member that is disposed inside the fixing belt 110 and receives radiant heat from the halogen lamp 120, and is disposed so that its lower surface is in sliding contact with the inner peripheral surface of the fixing belt 110. In the present embodiment, the nip plate 130 is made of metal, and is formed, for example, by bending an aluminum plate or the like having a higher thermal conductivity than a steel stay 160 described later. If the nip plate 130 is made of aluminum, the thermal conductivity of the nip plate 130 can be improved.

  As shown in FIGS. 2 and 3, the nip plate 130 includes a plate-like portion 131, a bent portion 132, a lubricant regulating portion 133, and three detected portions 134.

  The plate-like portion 131 is a long plate-like member that is orthogonal to the vertical direction and that is long in the left-right direction. The plate-like portion 131 is sandwiched between the pressure belt 140 and the fixing belt 110 in a vertical direction. The nip portion N is formed. The plate-like portion 131 is arranged below the halogen lamp 120 and transmits heat from the halogen lamp 120 to the toner on the paper S via the fixing belt 110.

  Note that the inner surface (upper surface) of the plate-like portion 131 may be painted black or provided with a heat absorbing member. According to this, the radiant heat from the halogen lamp 120 can be efficiently absorbed.

  The bent portion 132 is formed to be bent in a substantially arc shape upward from the front end side (upstream side in a predetermined direction) of the plate-like portion 131. Specifically, as shown in FIG. 4, the bent portion 132 is bent toward a front wall 162 as an example of an upstream side wall of a stay 160 described later, and an upper end edge 132A thereof is connected to a flange 152 and a stay of the reflector 150 described later. It is supported by the front wall 162 through 160 flanges 164.

  In this way, the upper end edge 132A of the nip plate 130 is supported by the stay 160 via the reflecting plate 150, so that the nip plate 130 and the reflecting plate are compared to the case where the surface of the nip plate is supported by the stay via the reflecting plate, for example. The heat transfer area with 150 can be reduced. Since the heat transfer area is reduced in this way, the amount of heat transferred from the nip plate 130 to the stay 160 can be reduced, so that the nip plate 130 can be efficiently heated.

  Further, since the upper end edge 132A of the bent portion 132 is supported by the surfaces of the flanges 152 and 164, even if the position of the upper end edge 132A of the bent portion 132 is slightly shifted in the transport direction due to an error, the upper end edge 132A is moved to the flange 152. , 164 can be reliably supported.

  Further, the bent portion 132 is disposed so as to face the halogen lamp 120 (see FIG. 2). Thereby, since the bent portion 132 is directly heated by the halogen lamp 120, the sheet S before entering the nip portion N can be preheated (preheated) by the bent portion 132, and the heat fixing property can be improved. It is possible.

  The bent portion 132 has a first bent portion 135 and a second bent portion 136 provided on the front side of the first bent portion 135.

  The first bent portion 135 is formed with a first radius of curvature R1 that is larger than the third radius of curvature R3 of the third bent portion 137 between the plate-like portion 131 and the lubricant regulating portion 133. Thus, by increasing the radius of curvature R1 of the first bent portion 135 on the front side of the nip plate 130, the first bent portion 135 can guide the fixing belt 110 toward the nip portion N well. It has become. Further, since the radius of curvature R3 of the third bent portion 137 on the rear side is reduced, for example, the fixing device 100 is moved back and forth as compared with a mode in which the radius of curvature of the third bent portion is increased in the same manner as the radius of curvature of the first bent portion. It is possible to reduce the size in the direction (conveying direction).

  The second bent portion 136 is formed with a second curvature radius R2 that is smaller than the first curvature radius R1. Accordingly, for example, the upper end edge 132A of the bent portion 132 can be positioned on the rear side by the small second curvature radius R2 as compared with the case where the bent portion 132 is formed with one kind of large radius of curvature. It is possible to reduce the size.

  Furthermore, by reducing the radius of curvature R2 of the second bent portion 136, the angle of the corner formed between the second bent portion 136 and the fixing belt 110 can be increased to increase the corner. It has become. A lubricant G is provided at the corners (between the second bent portion 136 and the fixing belt 110) that are formed in such a large size. Thereby, the lubricant G can be favorably held by the large corners.

  In the present embodiment, the first bent portion 135 and the second bent portion 136 are both formed in an arc shape that is convex outward in the radial direction of the fixing belt 110. Here, for example, when the convex direction of the second bent portion is directed in the direction opposite to the first bent portion (inward in the radial direction), the extended portion extends from the edge of the second bent portion to the upstream side in the transport direction. When the extended portion is pushed by the stay, a moment is applied in the direction of opening the bent portion, and the nip plate is easily bent. However, in the present embodiment, since the first bent portion 135 and the second bent portion 136 are convex in the same direction, an extension portion extending upstream in the transport direction is not formed, and the upper end of the bent portion 132 is formed. The nip plate 130 can be pushed well through the edge 132A without bending.

  In the present embodiment, the upper end 132A of the nip plate 130 is supported by the stay 160 on the front side of the nip plate 130 as described above, but the surface of the nip plate 130 is disposed on the rear side of the nip plate 130. It is supported by the stay 160. Specifically, the plate-like portion 131 includes an extension portion 131A extending rearward from the nip portion N, and the upper surface of the extension portion 131A is formed on the downstream side wall of the stay 160 via a flange 152 of the reflector 150 described later. As an example, it is supported by a rear wall 163.

  In this way, by supporting the upper surface of the extension portion 131A with the stay 160, for example, the bent portion on the rear side of the nip plate has a large radius of curvature in the same manner as the bent portion on the front side, and the edge on the rear side of the nip plate with the stay. Compared to the supporting structure, the position at which the nip plate 130 is supported by the stay 160 can be closer to the nip portion N, so that the fixing device 100 can be prevented from being enlarged in the transport direction. Also, by providing an extension 131A that extends rearward from the nip N along the conveying direction, a larger nip width is ensured compared to, for example, a structure in which the rear portion of the plate-like portion is bent near the nip. It is possible to do.

  As shown in FIGS. 3 and 4, the lubricant restricting portion 133 is formed so as to extend upward (in the radial direction of the fixing belt 110) from the rear edge of the plate-like portion 131. Specifically, the lubricant restricting portion 133 is formed so as to extend from one end side to the other end side in the left-right direction (axial direction) of the rear edge of the plate-like portion 131. As a result, the lubricant regulating portion 133 effectively suppresses the lubricant G adhering to the inner peripheral surface of the fixing belt 110 from flowing into the upper surface of the plate-like portion 131 (the surface on which black coating or the like has been applied). Therefore, it is possible to suppress a reduction in heating efficiency of the nip plate 130.

  Each of the three detected parts 134 is a part whose temperature is detected by a temperature detection member 400 such as a thermistor or a thermostud, and is formed to extend from a part of the upper end edge 133A of the lubricant regulating part 133 to the rear side. ing. Each detected portion 134 is formed to be shorter than the plate-like portion 131 in the left-right direction (the axial direction of the fixing belt 110), and both end edges 134A, 134B in the left-right direction are adjacent to the space.

  Specifically, the upper surface 134C (the surface facing the temperature detection member 400) of the detected portion 134 is arranged above the upper end edge 133A of the lubricant regulating portion 133 (in the direction in which the upper end edge 133A faces). Thereby, it is possible to suppress the lubricant G from flowing to the upper surface 134 </ b> C of the detected portion 134 along the upper end edge 133 </ b> A of the lubricant regulating portion 133.

  Moreover, the lubricant regulating part 133 is formed at a right angle to the transport direction. Thereby, it is possible to more effectively dam the inflow of the lubricant G into the plate-like portion 131.

  Further, a notch 133B that is recessed downward (to the base end side of the lubricant restricting portion 133) is formed in a portion of the upper end edge 133A of the lubricant restricting portion 133 that is adjacent to the detected portion 134. Thereby, it is possible to satisfactorily stop the movement of the lubricant G to the detected part 134 at the notch 133B while suppressing the height (position in the vertical direction) of the detected part 134.

  The temperature detection member 400 may be a contact sensor that detects the temperature of the detected part 134 (nip plate 130) by contacting the detected part 134, or does not contact the detected part 134. A non-contact sensor that detects the temperature of the detected part 134 may be used.

  In this embodiment, the temperature detection member 400 is pressed against the detected part 134 by the coil spring 410.

  As shown in FIG. 2, the pressure roller 140 is a member that forms a nip portion N with the fixing belt 110 by sandwiching the fixing belt 110 with the nip plate 130. Has been placed. In the present embodiment, in order to form the nip portion N, one of the nip plate 130 and the pressure roller 140 is urged toward the other. The pressure roller 140 rotates with the fixing belt 110 sandwiched between the nip plate 130 and rotates together with the fixing belt 110 to convey the paper S backward.

  The pressure roller 140 is configured to be driven to rotate by a driving force transmitted from a motor (not shown) provided in the main body housing 2, and is rotated with the fixing belt 110 (or the sheet S). The fixing belt 110 is driven to rotate by the frictional force. The sheet S on which the toner image is transferred is transported between the pressure roller 140 and the heated fixing belt 110 (nip portion N), whereby the toner image (toner) is thermally fixed.

  The reflection plate 150 is a member that reflects the radiant heat from the halogen lamp 120 toward the nip plate 130, and is disposed at a predetermined interval from the halogen lamp 120 so as to surround the halogen lamp 120 inside the fixing belt 110. ing.

  The reflecting plate 150 is formed by curving an aluminum plate or the like in a U shape in a sectional view, for example, having high infrared and far-infrared reflectance. More specifically, the reflecting plate 150 includes a reflecting portion 151 having a U-shape, and a flange 152 extending from both end edges (each end edge on the nip plate 130 side) in the front-rear direction of the reflecting portion 151 toward the outer side in the front-rear direction. Have.

  Each flange 152 is sandwiched between the stay 160 and the nip plate 130 as described above.

  The stay 160 is a member that receives a load from the pressure roller 140 by supporting the nip plate 130 via the reflection plate 150, and is arranged so as to surround the halogen lamp 120 and the reflection plate 150 inside the fixing belt 110. ing. Note that the load referred to here is the reaction force of the force with which the nip plate 130 biases the pressure roller 140 in the configuration in which the nip plate 130 biases the pressure roller 140.

  Specifically, as shown in FIG. 4, the stay 160 includes a top wall 161, a front wall 162 that extends downward from the front end of the upper wall 161, and a rear wall 163 that extends downward from the rear end of the upper wall 161. It is formed in a U shape. A flange 164 extending to the front side is formed at the lower end of the front wall 162.

  Such a stay 160 has relatively high rigidity, for example, is formed by bending a steel plate or the like.

  As shown in FIG. 2, the cover member 200 mainly includes a first cover member 210 and a second cover member 220.

  The first cover member 210 has a U-shape in cross section and is formed to extend in the left-right direction, and is disposed so as to cover the stay 160 on the opposite side of the halogen lamp 120 with the stay 160 interposed therebetween. . The first cover member 210 includes a rear side wall 211, a front side wall 212, an upper wall 213 extending so as to connect the upper ends of the rear side wall 211 and the front side wall 212, and an extension extending rearward from the lower end of the rear side wall 211. It mainly has an exit wall 214.

  An upstream guide 310 that guides the front lower portion of the fixing belt 110 is formed at the lower end of the front side wall 212. A downstream guide 320 is formed at the rear end of the extending wall 214 to guide the lower rear portion of the fixing belt 110.

  The upstream guide 310 is provided upstream of the nip portion N in the rotation direction of the fixing belt 110 and guides the fixing belt 110 toward the nip portion N. The upstream guide 310 protrudes below the flange 152 of the reflecting plate 150 (on the nip plate 130 side).

  Accordingly, the upstream guide 310 can suppress the fixing belt 110 from being caught by the flange 152 of the reflecting plate 150.

  As shown in FIG. 4, the downstream guide 320 is disposed on the rear side of the nip plate 130 and on the lower side (radially outside) of the detected portion 134, and guides the inner peripheral surface of the fixing belt 110. Yes. As a result, it is possible to more reliably suppress the fixing belt 110 from coming into contact with the detected portion 134, thereby reliably suppressing the lubricant G from flowing directly from the inner peripheral surface of the fixing belt 110 to the detected portion 134. Is possible.

  As shown in FIG. 2, the second cover member 220 is formed so as to extend long in the left-right direction, and is disposed so as to cover a part of the first cover member 210. The second cover member 220 mainly has an upper wall 221, a rear wall 222 extending downward from the rear end of the upper wall 221, and an extending wall 223 extending rearward from the lower end of the rear wall 222. ing. An upper guide 330 that guides the upper portion of the fixing belt 110 is formed at both ends of the upper wall 221 in the left-right direction.

  In addition, this invention is not limited to the said embodiment, It can utilize with various forms so that it may illustrate below.

  In the above embodiment, the upper end edge 132A of the bent portion 132 of the nip plate 130 is indirectly supported by the front wall 162 of the stay 160 via the flange 152 of the reflecting plate 150 and the flange 164 of the stay 160. For example, the edge of the bent portion may be directly supported by the end of the upstream side wall of the stay.

  In the embodiment, the paper S such as a thick paper, a postcard, and a thin paper is exemplified as an example of the recording sheet. However, the present invention is not limited to this, and may be an OHP sheet, for example.

  In the above embodiment, the halogen lamp 120 is illustrated as an example of the heating element. However, the present invention is not limited to this, and for example, a heating resistor or the like may be adopted.

  In the embodiment, the pressure roller 140 is exemplified as the backup member. However, the present invention is not limited to this, and may be, for example, a belt-like pressure member.

DESCRIPTION OF SYMBOLS 100 Fixing device 110 Fixing belt 120 Halogen lamp 130 Nip plate 132 Bending part 132A Edge 140 Pressure roller 160 Stay 162 Front wall N Nip part S Paper

Claims (8)

  1. A fixing device for thermally fixing a developer image on a recording sheet while moving the recording sheet in a predetermined direction,
    A tubular member having flexibility;
    A heating element disposed inside the cylindrical member;
    A nip plate disposed inside the cylindrical member and receiving radiant heat from the heating element;
    A U-shaped stay in cross-section that supports the nip plate in a state of surrounding the heating element;
    A backup member that forms a nip portion with the tubular member by sandwiching the tubular member with the nip plate, and
    A bent portion that is bent toward the upstream side wall on the upstream side of the stay is formed on the upstream side in the predetermined direction of the nip plate, and an edge of the bent portion is supported by the upstream side wall of the stay. A fixing device.
  2.   The fixing device according to claim 1, wherein the bent portion faces the heating element.
  3.   The bent portion is provided with a first bent portion formed with a predetermined first radius of curvature and a second radius of curvature smaller than the first radius of curvature provided on the upstream side of the first bent portion. The fixing device according to claim 1, further comprising a second bent portion.
  4.   The fixing device according to claim 3, wherein a lubricant is provided between the second bent portion and the cylindrical member.
  5. A flange extending to the upstream side is formed at an end of the upstream side wall of the stay,
    The fixing device according to claim 1, wherein an edge of the bent portion of the nip plate is supported by a surface of the flange.
  6. A U-shaped reflecting plate that is disposed inside the cylindrical member so as to surround the heating element and reflects radiant heat from the heating element toward the nip plate,
    A flange extending outward along the predetermined direction is formed at each edge of the reflector on the nip plate side,
    The fixing device according to claim 1, wherein the flange of the reflection plate is sandwiched between the stay and the nip plate.
  7. An upstream guide provided on the upstream side of the nip portion in the rotational direction of the cylindrical member and guiding the cylindrical member toward the nip portion;
    The fixing device according to claim 6, wherein the upstream guide protrudes closer to the nip plate than the flange of the reflecting plate.
  8.   The nip plate includes an extension extending downstream from the nip along the predetermined direction, and a surface of the extension is supported by a downstream side wall on the downstream side of the stay in the predetermined direction. The fixing device according to any one of claims 1 to 7.
JP2011260508A 2011-11-29 2011-11-29 Fixing device Active JP5935305B2 (en)

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JP2011260508A JP5935305B2 (en) 2011-11-29 2011-11-29 Fixing device
US13/625,043 US8938193B2 (en) 2011-11-29 2012-09-24 Fuser unit

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JP2013114057A true JP2013114057A (en) 2013-06-10
JP5935305B2 JP5935305B2 (en) 2016-06-15

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015114394A (en) * 2013-12-09 2015-06-22 富士ゼロックス株式会社 Fixing device and image forming apparatus
US9063485B2 (en) 2012-09-26 2015-06-23 Brother Kogyo Kabushiki Kaisha Fixing device
JP2015197539A (en) * 2014-03-31 2015-11-09 ブラザー工業株式会社 fixing device
US10295936B2 (en) 2016-07-28 2019-05-21 Canon Kabushiki Kaisha Fixing device

Citations (5)

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